You're absolutely underestimating the complexity of proper live preview of changes. This is essentially "hot reload" mode, but on the public internet, because it has to run on a public domain. Getting that right is a challenge, and if you don't know why, you haven't attempted to solve it yet.
replyWhy would I want my WIP site to be on the public internet? This has been built into Jekyll for years. Probably other SSGs too but I don't know/use them.
reply jekyll serve --watch --incrementalBecause you're thinking in the context of a solo developer working on their site locally. You don't need a CMS. People that want to collaboratively work on a website, some of which may lack technical skills, need a way of previewing their edits that doesn't involve running shell commands.
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